Above, the interaction potential in the one dimension of
reduced distance \(b\)  [1]} was generalized with
a neural network. Now, we move to more generic 2D potentials.
Figure REF a shows the interaction potential in 2D
for the classical Social Force model. It is an exact ellipse where the pedestrian
is at one of the focal points and the distance of the focal points of the
ellipse is related to the velocity of the pedestrian. The variable \(b\) 
is the semi-minor axis of this ellipse.
